Drilling-machine



(No Model.)

A. L` STANFORD.

DRILLING MACHINE.

' llNi'rnn STATES PATENT print,

ARTHUR L. STANFORD, OF WUKEGAN,ILLINOIS. o

DRlLLlNG-MCHINE.

SPCIFICATION forming part of Letters Patent No. 871,859, datel October1B, 188'7.

Original application filctl May 5, 1887, Serial No. 237,274. Divided andthis application filod August 18, 1887. Serial No. 247,239.

` (No model.)

To aZZ 20720771, it may concern:

Be it known that I, ARTHUR L. STANFORD, a citizen of the United States,residing at Vaukegan, in the county of Lake and State of Illinois, haveinvented a new and useful Improvement in Hand Metal-Drills, (forwhich Imade application for Letters Patent May 5, 1887, Serial No. 287,274,) ofwhich the following is a divisional specification.

The object of my invention is to improve the construction of hand drillsfor boring metal; and the invention, which is an improvement on the onedescribed in my patent of March 1, 1887, No. 858,755, consists in thefeatures and combinations hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a side elevation of myimproved hand metaldrill; Fig. 2, a Vertical sectional view of the same,and Fig. 3 a plan sectional view taken in the line w x of Fig. 2.

A is the pivot-piece to come in contact with the frame opposite themetal to be drilled; B, the cover for the inner end ofthe pivot-piece;O, the feed-screw; D, the lever for turning the fced-screw; E, theratchet-wheel engaging with the lever D, for Operating the hand-feed-orfor reversing,` the feed-screw, and which is also provided with a clutchto hold the pinion F rigid with the feedscrew; F, a pinion which isloose on the feed-screw, except when the automatic feed is used; G, theinternal gearwheel to aid in regulating the relative movement of thefeed-screw and feed-cylinder; H, the inner feed-cylinder, and h a pinionon the end thereof; I, the outerfeed-cylinder; J, the` l 1, 1887, abovereferred to.

to form suitable bearings and protection for the parts which comprisethe automatic feed. Its spherical bearing comes inV contact with theside of the frame, and, being spherical, permits a reasonable adjustment of the drillbit, and thus obviates the necessity of having,` itset exactly at right angles to 'the metal to be drilled. At the oppositeside of the end piece or metal on which this spherical bearing is formedis the bearing for the end of the feedscrew. The box or housing of thepivot-piece furnishes protection to the working parts against sand,dirt, 8m., and its inner end or cover a bearing for the inner cylinder.

The ratchet-wheel E, which is stationary in the hand-feed, is movablelongitudinally when desired to be used in the automatic feed, and it isprovided with a clutch at its inner' side, which permits it to engagewith the loose pinion F of the automatic feed devices. These automaticfeed devices are so constructed as to give an unequal number ofrevolutions to the outer feed-cylinder and feed-screw, as follows: 4Thepinion F is made rigid with the feed-sorew by having the clutch of theratohetwheel engaged th erewi th, as already described.

The pinion h, which is integral with the inside cylinder, is soconstrncted that it can have no rotary movement relative to thefeed-cylinder. These two pinions preferably have an unequal number ofcogs, which are adapted to engage with an internal gear-wheel, G, whichgearwheel preferably has an equal number of cogs in both its parts. Thisconstruction can be reversed, so as to have an unequal number of cogs ineach part of the internal gear-wheel and an equal number in the othertwo pinions; or all the pinions may be provided with an unequal numberof cogs, but of course in such away as not to interfere with theirmovements or Operations, the only object in this respect being to givean unequal number of revolutions to the outer feed-cylinder andfeedscrew. This internal gear-wheel, G, is preferably of peculiarconstruction, having its central portion plane to bear on the eccentricdisk N, through which the feed-screw passes, and its adjacentv sideportions provided with cogs to mesh into the pinions F and h. Thiseccentric disk is made rigid with the pivotpiece by means of aprojecting portion or stud ICO engaging with the pivot-piece or itscover. The hole for the feed-screw in this eccentric disk is of courseat a suitable distance from its center to cause the internal gear-wheelto thus engage with these pinions, the object of this construction beingto give an unequal number of revolutions to the feed-screw andfeedcylinder.

It will of course be understood that the feedscrew and feed-cylinder areso threaded as to permit of their proper relative inovements to make thefeed effective.

As already stated, the inside cylinder' terminates in a pinion, and itextends within the feed-cylinder to the head of the feed-screw. It isalso provided with a longitudinal slot, into which a screw, stud, orother suitable device is inserted to cause it -to revolve with thefeed-cylinder. The outer. cylinder is made large enough to receive theinner cylinder, and is screwed onto the drill-bit carrier and made rigidby a key, O, passing through it and such carrier. I prefer to use asplit key for this purpose, inasmuch as it may be readily inserted orreinoved. The diaineter of the drill-bit carrieris suffi'cient toreceive the drillbit and permit the latter to be shoved into it to thepoint of its seat.

Encircling a portion of the drill-bit carrier is a peculiarly-formedpiece, K, preferably of oblong shape, thevinner surfaces of which areadapted to come in contact with rollers, and also to form recesses forsprings. The bearings for these rollers and Asprings should of course bein position and otherwise be adapted to permit their operation, ashereinafter described.

The rollers, which are equal in length to the thickness of theencircling-piece K, .are intended to be used in pairs, so as to bind thedrill-carrier at opposite lines or points. When in proper position,or inwhat I consider to be the best position for this purpose, a line drawnthrough the diametrical center of the rollers will also pass through thediametrical center of the drill-carrier. These rollers, being placed atopposite sides of the drill-carrier, of course prevent any unequalrubbing or binding. VVithin the recesses formed in the inner surface ofthe encircling piece are placed two small flat or leaf Springs thecurvature of which is so slight as to permit their being straightenedout by pressure or otherwise without breaking or losiug theirresiliency. This enables them to withstand the pressure of the rollers,and thus obviates the necessity of frequently replacing the springs. Therecesses in'which these springs are placed are so close to the rollersas to prevent their falling out or becoming displaced; or, in otherwords, these recesses are such distance from the lines on the curvedsurfaces of the encircling part where the rollers bind as to only leavespace enough for the springs.

I claim'- 1. In a hand-drill, an automatic feed comprising an outerfeed-cylinder, an inner cylinder provided With a pinion revolvingequally with the outer cylinder, a lfeed-screw provided with a pinionrigid therewith when the automatic feed is used, and an internalgear-wheel provided with bearings and Yen,=;aging with said two pinions,substantially as described.

2. In a hand-drill, a feed-screw having a ratchet clutch-wheelmountedthereon, and an automatic feed having a pinion engaging with saidratchet clutch-wheel, substantially as described. i i

3. In a hand-drill, an internal gear-wheel having one portion of itsinner ('ircumfe'rence plane and another portion'provided with cogs,substantially as described.

4. In an automatic feed for a hand-drill, a-n internal gear-wheel havingthe central porti'on of its inner circumference plane and the adjacentportions of its inner circumference provided with cogs, substantially asdescribed.

5. In an automatic feed for a haud-drill, an eccentric disk mounted onthe feed-screw and made rigid with the pivot-piece, substantially asdescribed. i

6. In an automatic feed for a hand-drill, an internal gear-Wheel and aneccentric disk mounted on the feed-screw and made rigid with thepivot-piece, and forming a bearing for the gear-wheel, whereby thegear-Wheel is held in position and made to engage with its pinions,substantially as described.

ARTHUR L. STANFORD.

Witnesses:

EPHRAIM BANNING, GEORGE-O. Coon:

